This is the last of the seven angels. See how you translated "seventh" in [Revelation 8.1](../08/01.md). Alternate translation: "the final angel" or "angel number seven" (See: [[rc://en/ta/man/translate/translate-ordinal]])
Here "kingdom" refers to the authority to rule the world. Alternate translation: "The authority to rule the world ... the authority that belongs to our Lord and his Christ" (See: [[rc://en/ta/man/translate/figs-metonymy]])